Chapter 9: IO Targets

Overview

Most drivers complete some I/O requests but pass other requests down the device stack. Drivers can also create I/O requests. Whether your driver creates new requests or simply passes down requests that it receives from the framework, the destination for that request is an I/O target.

This chapter starts with basic information about I/O targets. It then describes how a driver can create and format an I/O request and send the request to an I/O target.

For this chapter, you need …	From …
Samples
Echo_driver	%wdk%\Src\Umdf\Usb\Echo_driver
Filter	%wdk%\Src\Umdf\Usb\Filter
Fx2_Driver	%wdk%\Src\Umdf\Usb\Fx2_driver
Kbfiltr	%wdk%\Src\Kmdf\Kbfiltr\Sys
Ndisedge	%wdk%\Src\Kmdf\Ndisedge\60
Osrusbfx2	%wdk%\Src\Kmdf\Osrusbfx2\Sys\Final
Toastmon	%wdk%\Src\Kmdf\Toaster\Toastmon
Usbsamp	%wdk%\Src\Kmdf\Usbsamp
WDK documentation
ACCESS_MASK	http://go.microsoft.com/fwlink/?LinkId=80616
Handling I/O Requests in Framework-based Drivers	http://go.microsoft.com/fwlink/?LinkId=80613
Object Names	http://go.microsoft.com/fwlink/?LinkId=80615
Specifying WDF Directives	http://go.microsoft.com/fwlink/?LinkId=82953
WINUSB_SETUP_PACKET	http://go.microsoft.com/fwlink/?LinkId=83355